Reference Hub
Comprehensive networking reference including ports, protocols, and standards
Comprehensive networking reference including ports, protocols, and standards
Quick reference for common ports, IP ranges, CIDR notation, and more
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| Port | Protocol | Service | IANA Name | Description |
|---|---|---|---|---|
20 | TCP | FTP Data | ftp-data | File Transfer Protocol data channel |
21 | TCP | FTP Control | ftp | File Transfer Protocol control/command channel |
22 | TCP | SSH | ssh | Secure Shell, secure remote login (RFC 4253) |
23 | TCP | Telnet | telnet | Unencrypted remote login (legacy) |
25 | TCP | SMTP | smtp | Simple Mail Transfer Protocol, server to server relay |
53 | TCP/UDP | DNS | domain | Domain Name System; UDP for queries, TCP for large answers and zone transfers |
67 | UDP | DHCP Server | bootps | DHCP/BOOTP server port; registered as bootps |
68 | UDP | DHCP Client | bootpc | DHCP/BOOTP client port; registered as bootpc |
69 | UDP | TFTP | tftp | Trivial File Transfer Protocol |
80 | TCP | HTTP | http | Hypertext Transfer Protocol |
110 | TCP | POP3 | pop3 | Post Office Protocol version 3 |
119 | TCP | NNTP | nntp | Network News Transfer Protocol |
123 | UDP | NTP | ntp | Network Time Protocol |
137 | UDP | NetBIOS Name | netbios-ns | NetBIOS Name Service |
138 | UDP | NetBIOS Datagram | netbios-dgm | NetBIOS Datagram Service |
139 | TCP | NetBIOS Session | netbios-ssn | NetBIOS Session Service, SMB over NetBIOS |
143 | TCP | IMAP | imap | Internet Message Access Protocol; 143/udp is reserved |
161 | UDP | SNMP | snmp | Simple Network Management Protocol queries |
162 | UDP | SNMP Trap | snmptrap | SNMP trap and notification messages |
389 | TCP/UDP | LDAP | ldap | Lightweight Directory Access Protocol |
443 | TCP | HTTPS | https | HTTP over TLS |
445 | TCP | SMB | microsoft-ds | SMB directly over TCP, no NetBIOS session layer |
465 | TCP | SMTPS | submissions | Mail submission over implicit TLS, current practice per RFC 8314; IANA also lists urd here |
500 | UDP | IKE | isakmp | Internet Key Exchange for IPsec; registered as isakmp |
514 | UDP | Syslog | syslog | System logging (RFC 5426); 514/tcp is registered to shell (rsh), not syslog |
587 | TCP | SMTP Submission | submission | Mail submission with STARTTLS (RFC 6409) |
636 | TCP | LDAPS | ldaps | LDAP over TLS |
853 | TCP | DNS over TLS | domain-s | DNS over TLS (RFC 7858); 853/udp is DNS over DTLS and QUIC |
873 | TCP | rsync | rsync | rsync file synchronisation daemon |
993 | TCP | IMAPS | imaps | IMAP over implicit TLS |
995 | TCP | POP3S | pop3s | POP3 over implicit TLS |
1194 | UDP | OpenVPN | openvpn | OpenVPN; also runs over 1194/tcp |
1433 | TCP | MSSQL | ms-sql-s | Microsoft SQL Server |
1521 | TCP | Oracle DB | ncube-lm | Oracle TNS listener by convention; IANA assigns 1521 to nCube License Manager |
1701 | UDP | L2TP | l2tp | Layer 2 Tunneling Protocol (RFC 3931); 1701 is shared with l2f |
1723 | TCP | PPTP | pptp | Point-to-Point Tunneling Protocol control channel |
1883 | TCP | MQTT | mqtt | Message Queuing Telemetry Transport |
2375 | TCP | Docker API | docker | Docker REST API in plain text, unauthenticated; do not expose |
2376 | TCP | Docker API (TLS) | docker-s | Docker REST API over TLS |
3000 | TCP | Grafana / dev servers | hbci | Grafana and local dev servers by convention; IANA assigns 3000 to HBCI |
3306 | TCP | MySQL | mysql | MySQL and MariaDB |
3389 | TCP | RDP | ms-wbt-server | Remote Desktop Protocol |
4500 | UDP | IPsec NAT-T | ipsec-nat-t | IPsec NAT traversal (RFC 3948); 4500/tcp is TCP encapsulation (RFC 9329) |
5222 | TCP | XMPP Client | xmpp-client | XMPP client connection (RFC 6120); 5222/udp is reserved |
5269 | TCP | XMPP Server | xmpp-server | XMPP server to server connection (RFC 6120) |
5432 | TCP | PostgreSQL | postgresql | PostgreSQL database |
5900 | TCP | VNC | rfb | Remote Framebuffer, VNC display :0 |
6379 | TCP | Redis | redis | Redis key-value store; 6379/udp is reserved |
6443 | TCP | Kubernetes API | sun-sr-https | Kubernetes API server by convention; IANA assigns 6443 to Sun Service Registry HTTPS |
8080 | TCP | HTTP Alt | http-alt | Alternative HTTP port, common for proxies and app servers |
8443 | TCP | HTTPS Alt | pcsync-https | Alternative HTTPS port by convention; IANA assigns 8443 to pcsync-https |
8883 | TCP | MQTT over TLS | secure-mqtt | Secure MQTT |
9090 | TCP | Prometheus | websm | Prometheus by convention; IANA assigns 9090 to WebSM |
27017 | TCP | MongoDB | mongodb | MongoDB server; 27017/udp is reserved |
51820 | UDP | WireGuard | unassigned | WireGuard default by convention only; 51820 sits in the dynamic range IANA never assigns (RFC 6335 s6) |